Slow-developing La Nina could delay winter weather’s arrival in Missouri (LISTEN) by [email protected] | Oct 28, 2025 | News, Show Me Today, WeatherIt’s been an unseasonably warm October, but winter is eventually coming. Cold and snowy weather might take a while, though, due to the slow development of La Nina, which State Climatologist Zach Leasor explained to Missourinet’s Marshall Griffin.